PRELIMINARY TECHNICAL DATA
Poly-phaseMulti-Function
a
Energy Metering IC with Serial Port
ADE7754*
Preliminary Technical Data
The ADE7754 provides different solutions to measure Active
and Apparent Energy from the six analog inputs thus en-
abling the use of the ADE7754 in various Power meter
services as 3-phase 4-wire, 3-phase 3-wire but also 4-wire
delta.
In addition to RMS calculation, Real and Apparent power
informations, the ADE7754 provides system calibration
features for each phase, i.e., channel offset correction, phase
calibration and gain calibration. The CF logic output gives
instantaneous real power information.
The ADE7754 has a waveform sample register which enables
access to ADC outputs. The part also incorporates a detec-
tion circuit for short duration low or high voltage variations.
The voltage threshold levels and the duration (no. of half line
cycles) of the variation are user programmable.
A zero crossing detection is synchronized which the zero
crossing point of the line voltage of each of the three phases.
This information is used to measure each line’s Period. It is
also used internally to the chip in the Line Active Energy and
Line Apparent Energy accumulation modes. This permits
faster and more accurate calibration of the power calcula-
FEATURES
High Accuracy, supports IEC 687/61036
Compatible with 3-phase/3-wire, 3-phase/4-wire
and any type of 3-phase services
Less than 0.1% error in Active Power Measurement
over a dynamic range of 1000 to 1
The ADE7754 supplies Active Energy, Apparent Energy,
Voltage rms, Current rms and Sampled Waveform Data.
Digital Power, Phase & Input Offset Calibration.
An On-Chip temperature sensor ( 3ꢀC typ. after calibrationꢁ
On-Chip user Programmable thresholds for line voltage
SAG and overdrive detections.
A SPI compatible Serial Interface with Interrupt Request line
(IRQꢁ.
A pulse output with programmable frequency
Proprietary ADCs and DSP provide high accuracy over large
variations in environmental conditions and time.
Reference 2.4V 8% (Drift 30 ppm/ꢀC typicalꢁ
with external overdrive capability
Single 5V Supply, Low power (80mW typicalꢁ
GENERAL DESCRIPTION
The ADE7754 is a high accuracy Poly-phase electrical tions. This signal is also useful for synchronization of relay
switching.
energy measurement IC with a serial interface and a pulse
output. The ADE7754 incorporates second order sigma-
delta ADCs, reference circuitry, temperature sensor, and all
the signal processing required to perform Active, Apparent
Energy measurements and rms calculation.
Data is read from the ADE7754 via the SPI serial interface.
The interrupt request output (IRQ) is an open drain, active
low logic output. The IRQ output will go active low when one
or more interrupt events have occurred in the ADE7754. A
status register will indicate the nature of the interrupt.
The ADE7754 is available in a 24-lead SOIC package.
FUNCTIONAL BLOCK DIAGRAM
AVDD
RESET
17
4
AVGAIN
AVRMSOS
ADE7754
2
Σ
X
Power
Supply
Monitor
AVAG
AIRMSOS
2
X
Σ
AAPGAIN
PGA1
5
6
IAP
IAN
VAP
|X|
ABS
ADC
ADC
Σ
HPF
LPF2
PGA2
16
AAPOS
AWG
Φ
APHCAL
BVGAIN
BVRMSOS
2
Σ
Σ
X
BVAG
BIRMSOS
CFNUM
2
X
Σ
BAPGAIN
PGA1
Σ
7
IBP
IBN
|X|
1
CF
ADC
ADC
Σ
DFC
8
HPF
BPHCAL
LPF2
PGA2
15
VBP
ABS
BAPOS
CVRMSOS
BWG
Φ
CFDEN
3
2
DVDD
DGND
CLKIN
CLKOUT
2
X
Σ
CVAG
CIRMSOS
CVGAIN
19
20
2
X
PGA1
Σ
CAPGAIN
ICP
ICN
VCP
VN
VADIV
WDIV
|X|
ADC
ADC
Σ
10
14
HPF
CPHCAL
PGA2
LPF2
ABS
ADC
CAPOS
CWG
Φ
13
ADE7754 REGISTERS &
SERIAL INTERFACE
TEMP
SENSOR
4kΩ
2.5V
REF
11
12
22
24
23
18
21
* Patents pending.
REFIN/OUT
DIN DOUT SCLK
CS IRQ
AGND
REV. PrG 01/03
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
Fax: 781/326-8703
World Wide Web Site: http://www.analog.com
© Analog Devices, Inc., 2003
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